Gram Research analysis of a 2026 Israeli study of 134 adults with type 2 diabetes found that those with the highest nutrition knowledge were 4.6 times more likely to follow the Mediterranean diet well compared to those with the lowest knowledge. However, nutrition knowledge explained only 16% of why people actually stick to healthy diets, suggesting that other factors like food preferences, convenience, cost, and daily habits play a much larger role in determining eating behavior.
A new study looked at whether people with type 2 diabetes who know more about nutrition actually follow the Mediterranean diet better. Researchers in Israel surveyed 134 adults with diabetes and found that those with the highest nutrition knowledge were about 4.6 times more likely to stick to a Mediterranean diet compared to those with the lowest knowledge. However, the study also discovered that nutrition knowledge only explains a small part of why people follow healthy diets—other factors like habits, preferences, and lifestyle play a much bigger role in determining what people actually eat.
Key Statistics
A 2026 cross-sectional study of 134 Israeli adults with type 2 diabetes found that people in the highest tertile of nutrition knowledge were 4.6 times more likely to achieve high Mediterranean diet adherence compared to those in the lowest knowledge tertile.
According to research reviewed by Gram, nutrition knowledge explained only 16% of the variation in Mediterranean diet adherence among 134 Israeli adults with type 2 diabetes, indicating that unmeasured factors account for 84% of dietary behavior differences.
A 2026 study of 134 Israeli diabetes patients found the average nutrition knowledge score was 12.1 out of 17 points and the average Mediterranean diet adherence score was 11.0 out of 17, suggesting moderate but incomplete knowledge and adherence in the study population.
The Quick Take
- What they studied: Whether knowing more about healthy eating helps people with type 2 diabetes actually follow the Mediterranean diet, which is known to be good for blood sugar control.
- Who participated: 134 Israeli adults with type 2 diabetes visiting a diabetes clinic, with an average age of 70 years; about 55% were women.
- Key finding: People with the highest nutrition knowledge scores were 4.6 times more likely to follow the Mediterranean diet well compared to those with the lowest knowledge scores.
- What it means for you: While learning about healthy eating does help people with diabetes make better food choices, knowledge alone isn’t enough. Other things like personal preferences, daily habits, and life circumstances matter just as much or more than knowing the facts about nutrition.
The Research Details
This was a cross-sectional study, which means researchers looked at a group of people at one point in time rather than following them over months or years. Adults with type 2 diabetes who came to a diabetes clinic in Israel were asked questions about their nutrition knowledge using a survey tailored to foods available in Israel. The researchers also measured how well these same people followed the Mediterranean diet using a special screening tool called the Israeli Mediterranean Diet Adherence Screener. They collected additional health information from the patients’ medical records, including age, weight, and how long they’d had diabetes.
The researchers then used statistical analysis to see if people who knew more about nutrition were more likely to follow the Mediterranean diet. They adjusted their results to account for factors like age, sex, income level, and how long someone had diabetes, so these factors wouldn’t confuse the results.
Understanding whether nutrition education actually leads to better eating habits is important for doctors and health educators. If knowledge alone worked, teaching people about healthy eating would be enough. But if other factors matter more, healthcare providers need to help patients in different ways—like making healthy foods easier to access, helping them build new eating habits, or addressing emotional and social barriers to healthy eating.
This study has some important limitations to understand. The sample size of 134 people is relatively small, which means the results might not apply to all people with diabetes. The study only looked at one moment in time, so we can’t tell if nutrition knowledge causes better diet adherence or if people who already eat well happen to learn more about nutrition. The study was conducted in Israel with locally available foods, so results might differ in other countries. Additionally, the statistical model only explained 16% of why people follow the Mediterranean diet, meaning 84% of the reason comes from other unmeasured factors.
What the Results Show
The study found that people with the highest nutrition knowledge scores were significantly more likely to follow the Mediterranean diet well. Specifically, those in the top third of nutrition knowledge were 4.6 times more likely to be in the top third of Mediterranean diet adherence compared to those in the bottom third of knowledge. This difference remained even after accounting for age, sex, income, and diabetes duration.
However, the researchers discovered something important: nutrition knowledge only explains a small part of the picture. The statistical model showed that knowledge accounts for only about 16% of the variation in diet adherence. This means that 84% of why people follow or don’t follow the Mediterranean diet comes from other factors that weren’t measured in this study.
When researchers looked at the data in a different way—treating nutrition knowledge and diet adherence as continuous scores rather than dividing people into groups—the connection between knowledge and diet adherence was no longer statistically significant. This suggests the relationship between knowledge and behavior is weaker than the initial analysis suggested.
The average nutrition knowledge score was 12.1 out of a possible 17 points, suggesting that most participants had moderate but not excellent knowledge about healthy eating. The average Mediterranean diet adherence score was 11.0 out of 17, indicating that participants were following the diet at a moderate level. The study population was relatively old (average age 70 years) and had been living with diabetes for some time, which may affect how applicable these findings are to younger people with diabetes or those newly diagnosed.
Previous research has shown mixed results about whether nutrition education improves diet adherence. Some studies suggest that knowledge is important, while others find that behavior change requires much more than just information. This Israeli study adds to growing evidence that while nutrition knowledge helps, it’s not the main driver of dietary behavior. Other factors—like cultural food preferences, family eating patterns, convenience, cost, taste preferences, and emotional eating habits—appear to play larger roles in determining what people actually eat.
The study has several important limitations. First, it’s a snapshot in time, so we can’t prove that knowledge causes better diet adherence—it’s possible that people who already eat well are more motivated to learn about nutrition. Second, the sample of 134 people is relatively small and comes from a single clinic in Israel, so results may not apply to all people with diabetes worldwide. Third, the study didn’t measure many other factors that influence eating habits, such as food cost, availability, family support, stress levels, or personal food preferences. Fourth, the weak statistical relationship when data was analyzed differently suggests the main finding may not be very robust or reliable. Finally, the study relied on self-reported information about diet and knowledge, which can be less accurate than objective measurements.
The Bottom Line
For people with type 2 diabetes: Learning about healthy eating is helpful and worth doing, but it’s only one piece of the puzzle. To successfully follow the Mediterranean diet, also focus on building new eating habits, finding ways to make healthy foods convenient and affordable, and addressing emotional or social barriers to healthy eating. Work with a dietitian or diabetes educator who can help with practical strategies beyond just providing information. Moderate confidence level—the evidence shows knowledge helps, but the effect is modest.
People with type 2 diabetes should care about this research because it suggests that nutrition education alone may not be enough to change eating habits. Healthcare providers and diabetes educators should care because it indicates they need to offer more than just information—they should provide practical support, habit-building strategies, and help addressing barriers to healthy eating. Policymakers should care because it suggests that simply providing nutrition information in public health campaigns may have limited impact on actual behavior change.
If you’re learning about the Mediterranean diet to help manage your diabetes, expect gradual changes. Building new eating habits typically takes 2-3 months to feel natural. You may see improvements in blood sugar levels within 2-4 weeks of consistent adherence, but the full benefits of the Mediterranean diet for heart health and weight management develop over several months to a year.
Frequently Asked Questions
Does learning about healthy eating help people with diabetes follow better diets?
Yes, but only partially. A 2026 study of 134 Israeli adults with type 2 diabetes found that those with the highest nutrition knowledge were 4.6 times more likely to follow the Mediterranean diet well. However, knowledge explained only 16% of dietary adherence, meaning other factors matter much more.
What factors besides nutrition knowledge affect whether diabetics follow the Mediterranean diet?
The study didn’t measure them, but research suggests food cost, availability, family eating patterns, personal taste preferences, convenience, stress levels, and emotional eating habits likely play larger roles than knowledge alone in determining actual eating behavior.
Is the Mediterranean diet good for type 2 diabetes?
Yes, extensive research shows the Mediterranean diet helps manage blood sugar and reduces heart disease risk in people with type 2 diabetes. This study confirms that following it is beneficial, though it highlights that knowledge alone isn’t enough to maintain adherence.
How can I actually stick to a healthy diet if just knowing about it isn’t enough?
Work with a dietitian on practical strategies: meal planning, grocery shopping lists, cooking methods, and ways to overcome barriers like cost or convenience. Build habits gradually, find support from family or groups, and address emotional eating patterns—not just learn nutrition facts.
Can this study’s findings apply to people with diabetes in other countries?
The study was conducted in Israel with locally available foods and a small sample of 134 people, so results may differ elsewhere. However, the general principle—that knowledge alone doesn’t guarantee behavior change—likely applies across different populations and countries.
Want to Apply This Research?
- Track both your nutrition knowledge and your actual food choices. Log what you eat daily and rate your Mediterranean diet adherence weekly (0-10 scale). Also track barriers you encounter—cost, convenience, cravings, social situations—to identify which non-knowledge factors most affect your eating.
- Use the app to set specific, achievable eating goals based on Mediterranean diet principles (like ’eat fish twice this week’ or ‘add vegetables to lunch daily’) rather than just learning facts. Get reminders for meal planning, grocery shopping, and cooking. Connect with others following the Mediterranean diet for support and practical tips.
- Weekly check-ins on actual food choices and monthly reviews of patterns. Track which barriers appear most often and which strategies work best for you. Measure progress through food logs and blood sugar readings rather than just knowledge quizzes. Adjust your approach based on what actually works for your lifestyle, not just what you know is healthy.
This research summary is for educational purposes and should not replace professional medical advice. If you have type 2 diabetes, consult your doctor or registered dietitian before making significant dietary changes. The Mediterranean diet is generally considered healthy for diabetes management, but individual needs vary. This study shows an association between nutrition knowledge and diet adherence, but does not prove that one causes the other. Always work with your healthcare team to develop a personalized nutrition plan appropriate for your specific health conditions and medications.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.